let tel = "2020-02-12";
let day = "2020/02-23";
let reg = /^\d{4}([-\/])\d{2}\1\d{2}$/;
console.log(tel.match(reg));
console.log(day.match(reg));

let hd = "houdunren";
//区间 字母开头
let res = /^[a-z]\w{3,6}$/i;
